what u need to learn...
First-year students at Medical School were receiving their first anatomy
class with a real dead human body. They all gathered around the surgery
table with the body covered with a white sheet.
The professor started the class by telling them, "In medicine, it is
necessary to have two important qualities as a doctor, the first is that you
not to be disgusted by anything involving the human body".
For an example, the professor pulled back the sheet, stuck his finger in the
butt of the corpse, withdrew it and stuck it in his mouth.
"Go ahead and do the same thing", he told his students.
The students freaked out, hesitated for several minutes, but eventually took
turns sticking a finger in the butt of the dead body and sucking on it.
When everyone finished, the professor looked at the students and told them,
"The second most important quality is observation. I stuck in my middle
finger and sucked on my index finger. Now learn to pay attention!".